I'm tired out. I ______ all afternoon and I don't seem to have finished anything.

单项选择题I cried（）my voice, but still they could not hear me.

A. at top of
B. at the top of
C. on the top in
D. to the top of

单项选择题Every year a flood of farmers arrive in Shenzhen for money-making jobs they（）before leaving their hometowns.

A. promised
B. were promised
C. have promised
D. have been promised

单项选择题She didn't see me come and went on ______ her newspaper.

单项选择题In some remote places there are still very poor people who can't afford to live in ______ conditions.

单项选择题No decision______about any future appointment until all the candidates have been interviewed.

单项选择题While fashion is thought of usually ______ clothing, it is important to realize that it covers a much wider domain.

单项选择题William Sidney Porter, known as O. Henry, is most famous for ______.

单项选择题The villagers have already known ______ we'll do is to build the bridge.

单项选择题The new librarian still doesn't know ______ the out of date newspapers and magazines.

单项选择题Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.